Merge tag 'iio-for-6.1a' of https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into char-misc-next

Jonathan writes:

1st set of IIO new device support, features and cleanup for 6.1

This includes Nuno Sa's work to move the IIO core over to generic firmware
properties rather than having DT specific code paths. Combined with Andy
Shevchenko's long term work on drivers, this leaves IIO in a good state for
handling other firmware types.

New device support
- liteon,ltrf216a
  * New driver and dt bindings to support this Light sensor.
- maxim,max11205
  * New driver for this 16bit single channel ADC.
- memsensing,msa311
  * New driver for this accelerometer. Includes a string helper for read/write.
- richtek,rtq6056
  * New driver and dt binding to support this current monitor used to measure
    power usage.
- yamaha,yas530
  * Support the YAS537 variant (series includes several fixes for other parts
    and new driver features).

Staging graduation
- adi,ad7746 CDC. Cleanup conducted against set of roadtest tests using
  the posted RFC of that framework.

Features
- core
  * Large rework to make all the core IIO code use generic firmware properties.
    Includes switching some drivers over as well using newly provided
    generic interfaces and allowing removal of DT specific ones.
  * Support for gesture event types for single and double tap. Used in
    bosch,bma400.
- atmel,at91-sama5d2
  * Add support for temperature sensor which uses two muxed inputs to estimate
    the temperature.
  * Handle trackx bits of EMR register to improve temp sampling accuracy.
  * Runtime PM support.
- liteon,ltrf216a
  * Add a _raw channel output to allow working around an issue with
    differing conversions equations that breaks some user space controls.
- mexelis,mlx90632
  * Support regulator control.
- ti,tsc2046
  * External reference voltage support.

Clean up and minor fixes
- Tree-wide
  * devm_clk_get_enabled() replacements of opencoded equivalent.
  * Remaining IIO_DMA_MINALIGN conversions (the staging/iio drivers).
  * Various minor warning and similar cleanup such as missing static
    markings.
  * strlcpy() to strscpy() for cases where return value not checked.
  * provide units.h entries for more HZ units and use them in drivers.
- dt-bindings cleanup
  * Drop maintainers listss where the email address is bouncing.
  * Switch spi devices over to using spi-peripheral.yaml
  * Add some missing unevaluatedProperties / additionalProperties: false
    entries.
- ABI docs
  * Add some missing channel type specific sampling frequency entries.
  * Add parameter names for callback parameters.
- MAINTAINERS
  * Fix wrong ADI forum links.
- core
  * lockdep class per device, to avoid an issue with nest when one IIO
    device is the consumer of another.
  * White space tweaks.
- asc,dlhl60d
  * Use get_unaligned_be24 to avoid some unusual data manipulation and masking.
- atmel,at91-sama5d2
  * Fix wrong max value.
  * Improve error handling when measuring pressure and touch.
  * Add locks to remove races on updating oversampling / sampling freq.
  * Add missing calls in suspend and resume path to ensure state is correctly
    brought up if buffered capture was in use when suspend happened.
  * Error out of write_raw() callback if buffered capture enabled to avoid
    unpredictable behavior.
  * Handle different versions having different oversampling ratio support and
    drop excess error checking.
  * Cleanup magic value defines where the name is just the value and hence
    hurts readability.
  * Use read_avail() callback to provide info on possible oversampling ratios.
  * Correctly handle variable bit depth when doing oversampling on different
    supported parts. Also handle higher oversampling ratios.
- fsl,imx8qxp
  * Don't ignore errors from regulator_get_voltage() so as to avoid some
    very surprising scaling.
- invensense,icp10100
  * Switch from UNIVERSAL to DEFINE_RUNTIME_DEV_PM_OPS. UNIVERSAL rarely made
    sense and is now deprecated. In this driver we just avoid double disabling
    in some paths.
- maxim,max1363
  * Drop consumer channel map provision by platform data. There have been
    better ways of doing this for years and there are no in tree users.
- microchip,mcp3911
  * Update status to maintained.
- qcom,spmi-adc5
  * Support measurement of LDO output voltage.
- qcom,spmi-adc
  * Add missing channel available on SM6125 SoC.
- st,stmpe
  * Drop requirement on node name in binding now that driver correctly
    doesn't enforce it.
- stx104
  * Move to more appropriate addac directory
- ti,am335x
  * Document ti,am654-adc compatible already in use in tree.
- ti,hmc5843
  * Move dev_pm_ops out of header and use new pm macros to handle export.
- yamaha,yas530
  * Minor cleanups.

* tag 'iio-for-6.1a' of https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio: (142 commits)
  iio: pressure: icp10100: Switch from UNIVERSAL to DEFINE_RUNTIME_DEV_PM_OPS().
  iio: adc: max1363: Drop provision to provide an IIO channel map via platform data
  iio: accel: bma400: Add support for single and double tap events
  iio: Add new event type gesture and use direction for single and double tap
  iio: Use per-device lockdep class for mlock
  iio: adc: add max11205 adc driver
  dt-bindings: iio: adc: Add max11205 documentation file
  iio: magnetometer: yamaha-yas530: Use dev_err_probe()
  iio: magnetometer: yamaha-yas530: Make strings const in chip info
  iio: magnetometer: yamaha-yas530: Use pointers as driver data
  iio: adc: tsc2046: silent spi_device_id warning
  iio: adc: tsc2046: add vref support
  dt-bindings: iio: adc: ti,tsc2046: add vref-supply property
  iio: light: ltrf216a: Add raw attribute
  dt-bindings: iio: Add missing (unevaluated|additional)Properties on child nodes
  MAINTAINERS: fix Analog Devices forum links
  iio/accel: fix repeated words in comments
  dt-bindings: iio: accel: add dt-binding schema for msa311 accel driver
  iio: add MEMSensing MSA311 3-axis accelerometer driver
  dt-bindings: vendor-prefixes: add MEMSensing Microsystems Co., Ltd.
  ...

1 files changed, 580 insertions, 134 deletions

diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
index 279430c1d88c..4294d6539cdb 100644
--- a/drivers/iio/adc/at91-sama5d2_adc.c
+++ b/drivers/iio/adc/at91-sama5d2_adc.c
@@ -16,9 +16,11 @@
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/module.h>
-#include <linux/of_device.h>
+#include <linux/mod_devicetable.h>
 #include <linux/platform_device.h>
+#include <linux/property.h>
 #include <linux/sched.h>
+#include <linux/units.h>
 #include <linux/wait.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
@@ -26,9 +28,13 @@
 #include <linux/iio/trigger.h>
 #include <linux/iio/trigger_consumer.h>
 #include <linux/iio/triggered_buffer.h>
+#include <linux/nvmem-consumer.h>
 #include <linux/pinctrl/consumer.h>
+#include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
 
+#include <dt-bindings/iio/adc/at91-sama5d2_adc.h>
+
 struct at91_adc_reg_layout {
 /* Control Register */
 	u16				CR;
@@ -73,11 +79,14 @@ struct at91_adc_reg_layout {
 /* Startup Time */
 #define	AT91_SAMA5D2_MR_STARTUP(v)	((v) << 16)
 #define AT91_SAMA5D2_MR_STARTUP_MASK	GENMASK(19, 16)
+/* Minimum startup time for temperature sensor */
+#define AT91_SAMA5D2_MR_STARTUP_TS_MIN	(50)
 /* Analog Change */
 #define	AT91_SAMA5D2_MR_ANACH		BIT(23)
 /* Tracking Time */
 #define	AT91_SAMA5D2_MR_TRACKTIM(v)	((v) << 24)
-#define	AT91_SAMA5D2_MR_TRACKTIM_MAX	0xff
+#define	AT91_SAMA5D2_MR_TRACKTIM_TS	6
+#define	AT91_SAMA5D2_MR_TRACKTIM_MAX	0xf
 /* Transfer Time */
 #define	AT91_SAMA5D2_MR_TRANSFER(v)	((v) << 28)
 #define	AT91_SAMA5D2_MR_TRANSFER_MAX	0x3
@@ -138,11 +147,19 @@ struct at91_adc_reg_layout {
 /* Extended Mode Register */
 	u16				EMR;
 /* Extended Mode Register - Oversampling rate */
-#define AT91_SAMA5D2_EMR_OSR(V)			((V) << 16)
-#define AT91_SAMA5D2_EMR_OSR_MASK		GENMASK(17, 16)
+#define AT91_SAMA5D2_EMR_OSR(V, M)		(((V) << 16) & (M))
 #define AT91_SAMA5D2_EMR_OSR_1SAMPLES		0
 #define AT91_SAMA5D2_EMR_OSR_4SAMPLES		1
 #define AT91_SAMA5D2_EMR_OSR_16SAMPLES		2
+#define AT91_SAMA5D2_EMR_OSR_64SAMPLES		3
+#define AT91_SAMA5D2_EMR_OSR_256SAMPLES		4
+
+/* Extended Mode Register - TRACKX */
+#define AT91_SAMA5D2_TRACKX_MASK		GENMASK(23, 22)
+#define AT91_SAMA5D2_TRACKX(x)			(((x) << 22) & \
+						 AT91_SAMA5D2_TRACKX_MASK)
+/* TRACKX for temperature sensor. */
+#define AT91_SAMA5D2_TRACKX_TS			(1)
 
 /* Extended Mode Register - Averaging on single trigger event */
 #define AT91_SAMA5D2_EMR_ASTE(V)		((V) << 20)
@@ -159,6 +176,8 @@ struct at91_adc_reg_layout {
 	u16				ACR;
 /* Analog Control Register - Pen detect sensitivity mask */
 #define AT91_SAMA5D2_ACR_PENDETSENS_MASK        GENMASK(1, 0)
+/* Analog Control Register - Source last channel */
+#define AT91_SAMA5D2_ACR_SRCLCH		BIT(16)
 
 /* Touchscreen Mode Register */
 	u16				TSMR;
@@ -226,6 +245,10 @@ struct at91_adc_reg_layout {
 	u16				WPSR;
 /* Version Register */
 	u16				VERSION;
+/* Temperature Sensor Mode Register */
+	u16				TEMPMR;
+/* Temperature Sensor Mode - Temperature sensor on */
+#define AT91_SAMA5D2_TEMPMR_TEMPON	BIT(0)
 };
 
 static const struct at91_adc_reg_layout sama5d2_layout = {
@@ -280,6 +303,7 @@ static const struct at91_adc_reg_layout sama7g5_layout = {
 	.EOC_IDR =		0x38,
 	.EOC_IMR =		0x3c,
 	.EOC_ISR =		0x40,
+	.TEMPMR =		0x44,
 	.OVER =			0x4c,
 	.EMR =			0x50,
 	.CWR =			0x54,
@@ -305,11 +329,6 @@ static const struct at91_adc_reg_layout sama7g5_layout = {
 #define AT91_HWFIFO_MAX_SIZE_STR	"128"
 #define AT91_HWFIFO_MAX_SIZE		128
 
-/* Possible values for oversampling ratio */
-#define AT91_OSR_1SAMPLES		1
-#define AT91_OSR_4SAMPLES		4
-#define AT91_OSR_16SAMPLES		16
-
 #define AT91_SAMA5D2_CHAN_SINGLE(index, num, addr)			\
 	{								\
 		.type = IIO_VOLTAGE,					\
@@ -325,6 +344,8 @@ static const struct at91_adc_reg_layout sama7g5_layout = {
 		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
 		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ)|\
 				BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),	\
+		.info_mask_shared_by_all_available =			\
+				BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),	\
 		.datasheet_name = "CH"#num,				\
 		.indexed = 1,						\
 	}
@@ -346,6 +367,8 @@ static const struct at91_adc_reg_layout sama7g5_layout = {
 		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
 		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ)|\
 				BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),	\
+		.info_mask_shared_by_all_available =			\
+				BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),	\
 		.datasheet_name = "CH"#num"-CH"#num2,			\
 		.indexed = 1,						\
 	}
@@ -365,6 +388,8 @@ static const struct at91_adc_reg_layout sama7g5_layout = {
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
 		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ)|\
 				BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),	\
+		.info_mask_shared_by_all_available =			\
+				BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),	\
 		.datasheet_name = name,					\
 	}
 #define AT91_SAMA5D2_CHAN_PRESSURE(num, name)				\
@@ -380,6 +405,23 @@ static const struct at91_adc_reg_layout sama7g5_layout = {
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
 		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ)|\
 				BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),	\
+		.info_mask_shared_by_all_available =			\
+				BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),	\
+		.datasheet_name = name,					\
+	}
+
+#define AT91_SAMA5D2_CHAN_TEMP(num, name, addr)				\
+	{								\
+		.type = IIO_TEMP,					\
+		.channel = num,						\
+		.address =  addr,					\
+		.scan_index = num,					\
+		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),	\
+		.info_mask_shared_by_all =				\
+				BIT(IIO_CHAN_INFO_PROCESSED) |		\
+				BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),	\
+		.info_mask_shared_by_all_available =			\
+				BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),	\
 		.datasheet_name = name,					\
 	}
 
@@ -403,6 +445,12 @@ static const struct at91_adc_reg_layout sama7g5_layout = {
  * @max_index:		highest channel index (highest index may be higher
  *			than the total channel number)
  * @hw_trig_cnt:	number of possible hardware triggers
+ * @osr_mask:		oversampling ratio bitmask on EMR register
+ * @oversampling_avail:	available oversampling values
+ * @oversampling_avail_no: number of available oversampling values
+ * @chan_realbits:	realbits for registered channels
+ * @temp_chan:		temperature channel index
+ * @temp_sensor:	temperature sensor supported
  */
 struct at91_adc_platform {
 	const struct at91_adc_reg_layout	*layout;
@@ -414,20 +462,58 @@ struct at91_adc_platform {
 	unsigned int				max_channels;
 	unsigned int				max_index;
 	unsigned int				hw_trig_cnt;
+	unsigned int				osr_mask;
+	unsigned int				oversampling_avail[5];
+	unsigned int				oversampling_avail_no;
+	unsigned int				chan_realbits;
+	unsigned int				temp_chan;
+	bool					temp_sensor;
+};
+
+/**
+ * struct at91_adc_temp_sensor_clb - at91-sama5d2 temperature sensor
+ * calibration data structure
+ * @p1: P1 calibration temperature
+ * @p4: P4 calibration voltage
+ * @p6: P6 calibration voltage
+ */
+struct at91_adc_temp_sensor_clb {
+	u32 p1;
+	u32 p4;
+	u32 p6;
+};
+
+/**
+ * enum at91_adc_ts_clb_idx - calibration indexes in NVMEM buffer
+ * @AT91_ADC_TS_CLB_IDX_P1: index for P1
+ * @AT91_ADC_TS_CLB_IDX_P4: index for P4
+ * @AT91_ADC_TS_CLB_IDX_P6: index for P6
+ * @AT91_ADC_TS_CLB_IDX_MAX: max index for temperature calibration packet in OTP
+ */
+enum at91_adc_ts_clb_idx {
+	AT91_ADC_TS_CLB_IDX_P1 = 2,
+	AT91_ADC_TS_CLB_IDX_P4 = 5,
+	AT91_ADC_TS_CLB_IDX_P6 = 7,
+	AT91_ADC_TS_CLB_IDX_MAX = 19,
 };
 
+/* Temperature sensor calibration - Vtemp voltage sensitivity to temperature. */
+#define AT91_ADC_TS_VTEMP_DT		(2080U)
+
 /**
  * struct at91_adc_soc_info - at91-sama5d2 soc information struct
  * @startup_time:	device startup time
  * @min_sample_rate:	minimum sample rate in Hz
  * @max_sample_rate:	maximum sample rate in Hz
  * @platform:		pointer to the platform structure
+ * @temp_sensor_clb:	temperature sensor calibration data structure
  */
 struct at91_adc_soc_info {
 	unsigned			startup_time;
 	unsigned			min_sample_rate;
 	unsigned			max_sample_rate;
 	const struct at91_adc_platform	*platform;
+	struct at91_adc_temp_sensor_clb	temp_sensor_clb;
 };
 
 struct at91_adc_trigger {
@@ -475,6 +561,18 @@ struct at91_adc_touch {
 	struct work_struct		workq;
 };
 
+/**
+ * struct at91_adc_temp - at91-sama5d2 temperature information structure
+ * @sample_period_val:	sample period value
+ * @saved_sample_rate:	saved sample rate
+ * @saved_oversampling:	saved oversampling
+ */
+struct at91_adc_temp {
+	u16				sample_period_val;
+	u16				saved_sample_rate;
+	u16				saved_oversampling;
+};
+
 /*
  * Buffer size requirements:
  * No channels * bytes_per_channel(2) + timestamp bytes (8)
@@ -502,7 +600,9 @@ struct at91_adc_state {
 	wait_queue_head_t		wq_data_available;
 	struct at91_adc_dma		dma_st;
 	struct at91_adc_touch		touch_st;
+	struct at91_adc_temp		temp_st;
 	struct iio_dev			*indio_dev;
+	struct device			*dev;
 	/* Ensure naturally aligned timestamp */
 	u16				buffer[AT91_BUFFER_MAX_HWORDS] __aligned(8);
 	/*
@@ -591,6 +691,7 @@ static const struct iio_chan_spec at91_sama7g5_adc_channels[] = {
 	AT91_SAMA5D2_CHAN_DIFF(22, 12, 13, 0x90),
 	AT91_SAMA5D2_CHAN_DIFF(23, 14, 15, 0x98),
 	IIO_CHAN_SOFT_TIMESTAMP(24),
+	AT91_SAMA5D2_CHAN_TEMP(AT91_SAMA7G5_ADC_TEMP_CHANNEL, "temp", 0xdc),
 };
 
 static const struct at91_adc_platform sama5d2_platform = {
@@ -612,6 +713,10 @@ static const struct at91_adc_platform sama5d2_platform = {
 	.max_index = AT91_SAMA5D2_MAX_CHAN_IDX,
 #define AT91_SAMA5D2_HW_TRIG_CNT	3
 	.hw_trig_cnt = AT91_SAMA5D2_HW_TRIG_CNT,
+	.osr_mask = GENMASK(17, 16),
+	.oversampling_avail = { 1, 4, 16, },
+	.oversampling_avail_no = 3,
+	.chan_realbits = 14,
 };
 
 static const struct at91_adc_platform sama7g5_platform = {
@@ -619,14 +724,23 @@ static const struct at91_adc_platform sama7g5_platform = {
 	.adc_channels = &at91_sama7g5_adc_channels,
 #define AT91_SAMA7G5_SINGLE_CHAN_CNT	16
 #define AT91_SAMA7G5_DIFF_CHAN_CNT	8
+#define AT91_SAMA7G5_TEMP_CHAN_CNT	1
 	.nr_channels = AT91_SAMA7G5_SINGLE_CHAN_CNT +
-		       AT91_SAMA7G5_DIFF_CHAN_CNT,
+		       AT91_SAMA7G5_DIFF_CHAN_CNT +
+		       AT91_SAMA7G5_TEMP_CHAN_CNT,
 #define AT91_SAMA7G5_MAX_CHAN_IDX	(AT91_SAMA7G5_SINGLE_CHAN_CNT + \
-					AT91_SAMA7G5_DIFF_CHAN_CNT)
+					AT91_SAMA7G5_DIFF_CHAN_CNT + \
+					AT91_SAMA7G5_TEMP_CHAN_CNT)
 	.max_channels = ARRAY_SIZE(at91_sama7g5_adc_channels),
 	.max_index = AT91_SAMA7G5_MAX_CHAN_IDX,
 #define AT91_SAMA7G5_HW_TRIG_CNT	3
 	.hw_trig_cnt = AT91_SAMA7G5_HW_TRIG_CNT,
+	.osr_mask = GENMASK(18, 16),
+	.oversampling_avail = { 1, 4, 16, 64, 256, },
+	.oversampling_avail_no = 5,
+	.chan_realbits = 16,
+	.temp_sensor = true,
+	.temp_chan = AT91_SAMA7G5_ADC_TEMP_CHANNEL,
 };
 
 static int at91_adc_chan_xlate(struct iio_dev *indio_dev, int chan)
@@ -650,8 +764,8 @@ at91_adc_chan_get(struct iio_dev *indio_dev, int chan)
 	return indio_dev->channels + index;
 }
 
-static inline int at91_adc_of_xlate(struct iio_dev *indio_dev,
-				    const struct of_phandle_args *iiospec)
+static inline int at91_adc_fwnode_xlate(struct iio_dev *indio_dev,
+					const struct fwnode_reference_args *iiospec)
 {
 	return at91_adc_chan_xlate(indio_dev, iiospec->args[0]);
 }
@@ -725,51 +839,91 @@ static void at91_adc_eoc_ena(struct at91_adc_state *st, unsigned int channel)
 		at91_adc_writel(st, EOC_IER, BIT(channel));
 }
 
-static void at91_adc_config_emr(struct at91_adc_state *st)
+static int at91_adc_config_emr(struct at91_adc_state *st,
+			       u32 oversampling_ratio, u32 trackx)
 {
 	/* configure the extended mode register */
-	unsigned int emr = at91_adc_readl(st, EMR);
-
-	/* select oversampling per single trigger event */
-	emr |= AT91_SAMA5D2_EMR_ASTE(1);
+	unsigned int emr, osr;
+	unsigned int osr_mask = st->soc_info.platform->osr_mask;
+	int i, ret;
 
-	/* delete leftover content if it's the case */
-	emr &= ~AT91_SAMA5D2_EMR_OSR_MASK;
+	/* Check against supported oversampling values. */
+	for (i = 0; i < st->soc_info.platform->oversampling_avail_no; i++) {
+		if (oversampling_ratio == st->soc_info.platform->oversampling_avail[i])
+			break;
+	}
+	if (i == st->soc_info.platform->oversampling_avail_no)
+		return -EINVAL;
 
 	/* select oversampling ratio from configuration */
-	switch (st->oversampling_ratio) {
-	case AT91_OSR_1SAMPLES:
-		emr |= AT91_SAMA5D2_EMR_OSR(AT91_SAMA5D2_EMR_OSR_1SAMPLES) &
-		       AT91_SAMA5D2_EMR_OSR_MASK;
+	switch (oversampling_ratio) {
+	case 1:
+		osr = AT91_SAMA5D2_EMR_OSR(AT91_SAMA5D2_EMR_OSR_1SAMPLES,
+					   osr_mask);
 		break;
-	case AT91_OSR_4SAMPLES:
-		emr |= AT91_SAMA5D2_EMR_OSR(AT91_SAMA5D2_EMR_OSR_4SAMPLES) &
-		       AT91_SAMA5D2_EMR_OSR_MASK;
+	case 4:
+		osr = AT91_SAMA5D2_EMR_OSR(AT91_SAMA5D2_EMR_OSR_4SAMPLES,
+					   osr_mask);
 		break;
-	case AT91_OSR_16SAMPLES:
-		emr |= AT91_SAMA5D2_EMR_OSR(AT91_SAMA5D2_EMR_OSR_16SAMPLES) &
-		       AT91_SAMA5D2_EMR_OSR_MASK;
+	case 16:
+		osr = AT91_SAMA5D2_EMR_OSR(AT91_SAMA5D2_EMR_OSR_16SAMPLES,
+					   osr_mask);
+		break;
+	case 64:
+		osr = AT91_SAMA5D2_EMR_OSR(AT91_SAMA5D2_EMR_OSR_64SAMPLES,
+					   osr_mask);
+		break;
+	case 256:
+		osr = AT91_SAMA5D2_EMR_OSR(AT91_SAMA5D2_EMR_OSR_256SAMPLES,
+					   osr_mask);
 		break;
 	}
 
+	ret = pm_runtime_resume_and_get(st->dev);
+	if (ret < 0)
+		return ret;
+
+	emr = at91_adc_readl(st, EMR);
+	/* select oversampling per single trigger event */
+	emr |= AT91_SAMA5D2_EMR_ASTE(1);
+	/* delete leftover content if it's the case */
+	emr &= ~(osr_mask | AT91_SAMA5D2_TRACKX_MASK);
+	/* Update osr and trackx. */
+	emr |= osr | AT91_SAMA5D2_TRACKX(trackx);
 	at91_adc_writel(st, EMR, emr);
+
+	pm_runtime_mark_last_busy(st->dev);
+	pm_runtime_put_autosuspend(st->dev);
+
+	st->oversampling_ratio = oversampling_ratio;
+
+	return 0;
 }
 
 static int at91_adc_adjust_val_osr(struct at91_adc_state *st, int *val)
 {
-	if (st->oversampling_ratio == AT91_OSR_1SAMPLES) {
-		/*
-		 * in this case we only have 12 bits of real data, but channel
-		 * is registered as 14 bits, so shift left two bits
-		 */
-		*val <<= 2;
-	} else if (st->oversampling_ratio == AT91_OSR_4SAMPLES) {
-		/*
-		 * in this case we have 13 bits of real data, but channel
-		 * is registered as 14 bits, so left shift one bit
-		 */
-		*val <<= 1;
-	}
+	int nbits, diff;
+
+	if (st->oversampling_ratio == 1)
+		nbits = 12;
+	else if (st->oversampling_ratio == 4)
+		nbits = 13;
+	else if (st->oversampling_ratio == 16)
+		nbits = 14;
+	else if (st->oversampling_ratio == 64)
+		nbits = 15;
+	else if (st->oversampling_ratio == 256)
+		nbits = 16;
+	else
+		/* Should not happen. */
+		return -EINVAL;
+
+	/*
+	 * We have nbits of real data and channel is registered as
+	 * st->soc_info.platform->chan_realbits, so shift left diff bits.
+	 */
+	diff = st->soc_info.platform->chan_realbits - nbits;
+	*val <<= diff;
 
 	return IIO_VAL_INT;
 }
@@ -799,15 +953,22 @@ static void at91_adc_adjust_val_osr_array(struct at91_adc_state *st, void *buf,
 static int at91_adc_configure_touch(struct at91_adc_state *st, bool state)
 {
 	u32 clk_khz = st->current_sample_rate / 1000;
-	int i = 0;
+	int i = 0, ret;
 	u16 pendbc;
 	u32 tsmr, acr;
 
-	if (!state) {
+	if (state) {
+		ret = pm_runtime_resume_and_get(st->dev);
+		if (ret < 0)
+			return ret;
+	} else {
 		/* disabling touch IRQs and setting mode to no touch enabled */
 		at91_adc_writel(st, IDR,
 				AT91_SAMA5D2_IER_PEN | AT91_SAMA5D2_IER_NOPEN);
 		at91_adc_writel(st, TSMR, 0);
+
+		pm_runtime_mark_last_busy(st->dev);
+		pm_runtime_put_autosuspend(st->dev);
 		return 0;
 	}
 	/*
@@ -948,10 +1109,9 @@ static int at91_adc_read_pressure(struct at91_adc_state *st, int chan, u16 *val)
 	return IIO_VAL_INT;
 }
 
-static int at91_adc_configure_trigger(struct iio_trigger *trig, bool state)
+static void at91_adc_configure_trigger_registers(struct at91_adc_state *st,
+						 bool state)
 {
-	struct iio_dev *indio = iio_trigger_get_drvdata(trig);
-	struct at91_adc_state *st = iio_priv(indio);
 	u32 status = at91_adc_readl(st, TRGR);
 
 	/* clear TRGMOD */
@@ -962,6 +1122,26 @@ static int at91_adc_configure_trigger(struct iio_trigger *trig, bool state)
 
 	/* set/unset hw trigger */
 	at91_adc_writel(st, TRGR, status);
+}
+
+static int at91_adc_configure_trigger(struct iio_trigger *trig, bool state)
+{
+	struct iio_dev *indio = iio_trigger_get_drvdata(trig);
+	struct at91_adc_state *st = iio_priv(indio);
+	int ret;
+
+	if (state) {
+		ret = pm_runtime_resume_and_get(st->dev);
+		if (ret < 0)
+			return ret;
+	}
+
+	at91_adc_configure_trigger_registers(st, state);
+
+	if (!state) {
+		pm_runtime_mark_last_busy(st->dev);
+		pm_runtime_put_autosuspend(st->dev);
+	}
 
 	return 0;
 }
@@ -1120,11 +1300,15 @@ static int at91_adc_buffer_prepare(struct iio_dev *indio_dev)
 	if (!(iio_device_get_current_mode(indio_dev) & INDIO_ALL_TRIGGERED_MODES))
 		return -EINVAL;
 
+	ret = pm_runtime_resume_and_get(st->dev);
+	if (ret < 0)
+		return ret;
+
 	/* we continue with the triggered buffer */
 	ret = at91_adc_dma_start(indio_dev);
 	if (ret) {
 		dev_err(&indio_dev->dev, "buffer prepare failed\n");
-		return ret;
+		goto pm_runtime_put;
 	}
 
 	for_each_set_bit(bit, indio_dev->active_scan_mask,
@@ -1135,7 +1319,8 @@ static int at91_adc_buffer_prepare(struct iio_dev *indio_dev)
 			continue;
 		/* these channel types cannot be handled by this trigger */
 		if (chan->type == IIO_POSITIONRELATIVE ||
-		    chan->type == IIO_PRESSURE)
+		    chan->type == IIO_PRESSURE ||
+		    chan->type == IIO_TEMP)
 			continue;
 
 		at91_adc_cor(st, chan);
@@ -1146,12 +1331,16 @@ static int at91_adc_buffer_prepare(struct iio_dev *indio_dev)
 	if (at91_adc_buffer_check_use_irq(indio_dev, st))
 		at91_adc_writel(st, IER, AT91_SAMA5D2_IER_DRDY);
 
-	return 0;
+pm_runtime_put:
+	pm_runtime_mark_last_busy(st->dev);
+	pm_runtime_put_autosuspend(st->dev);
+	return ret;
 }
 
 static int at91_adc_buffer_postdisable(struct iio_dev *indio_dev)
 {
 	struct at91_adc_state *st = iio_priv(indio_dev);
+	int ret;
 	u8 bit;
 
 	/* check if we are disabling triggered buffer or the touchscreen */
@@ -1162,6 +1351,10 @@ static int at91_adc_buffer_postdisable(struct iio_dev *indio_dev)
 	if (!(iio_device_get_current_mode(indio_dev) & INDIO_ALL_TRIGGERED_MODES))
 		return -EINVAL;
 
+	ret = pm_runtime_resume_and_get(st->dev);
+	if (ret < 0)
+		return ret;
+
 	/*
 	 * For each enable channel we must disable it in hardware.
 	 * In the case of DMA, we must read the last converted value
@@ -1177,7 +1370,8 @@ static int at91_adc_buffer_postdisable(struct iio_dev *indio_dev)
 			continue;
 		/* these channel types are virtual, no need to do anything */
 		if (chan->type == IIO_POSITIONRELATIVE ||
-		    chan->type == IIO_PRESSURE)
+		    chan->type == IIO_PRESSURE ||
+		    chan->type == IIO_TEMP)
 			continue;
 
 		at91_adc_writel(st, CHDR, BIT(chan->channel));
@@ -1196,6 +1390,9 @@ static int at91_adc_buffer_postdisable(struct iio_dev *indio_dev)
 	if (st->dma_st.dma_chan)
 		dmaengine_terminate_sync(st->dma_st.dma_chan);
 
+	pm_runtime_mark_last_busy(st->dev);
+	pm_runtime_put_autosuspend(st->dev);
+
 	return 0;
 }
 
@@ -1224,6 +1421,7 @@ static struct iio_trigger *at91_adc_allocate_trigger(struct iio_dev *indio,
 
 	return trig;
 }
+
 static void at91_adc_trigger_handler_nodma(struct iio_dev *indio_dev,
 					   struct iio_poll_func *pf)
 {
@@ -1377,25 +1575,35 @@ static unsigned at91_adc_startup_time(unsigned startup_time_min,
 	return i;
 }
 
-static void at91_adc_setup_samp_freq(struct iio_dev *indio_dev, unsigned freq)
+static void at91_adc_setup_samp_freq(struct iio_dev *indio_dev, unsigned freq,
+				     unsigned int startup_time,
+				     unsigned int tracktim)
 {
 	struct at91_adc_state *st = iio_priv(indio_dev);
 	unsigned f_per, prescal, startup, mr;
+	int ret;
 
 	f_per = clk_get_rate(st->per_clk);
 	prescal = (f_per / (2 * freq)) - 1;
 
-	startup = at91_adc_startup_time(st->soc_info.startup_time,
-					freq / 1000);
+	startup = at91_adc_startup_time(startup_time, freq / 1000);
+
+	ret = pm_runtime_resume_and_get(st->dev);
+	if (ret < 0)
+		return;
 
 	mr = at91_adc_readl(st, MR);
 	mr &= ~(AT91_SAMA5D2_MR_STARTUP_MASK | AT91_SAMA5D2_MR_PRESCAL_MASK);
 	mr |= AT91_SAMA5D2_MR_STARTUP(startup);
 	mr |= AT91_SAMA5D2_MR_PRESCAL(prescal);
+	mr |= AT91_SAMA5D2_MR_TRACKTIM(tracktim);
 	at91_adc_writel(st, MR, mr);
 
-	dev_dbg(&indio_dev->dev, "freq: %u, startup: %u, prescal: %u\n",
-		freq, startup, prescal);
+	pm_runtime_mark_last_busy(st->dev);
+	pm_runtime_put_autosuspend(st->dev);
+
+	dev_dbg(&indio_dev->dev, "freq: %u, startup: %u, prescal: %u, tracktim=%u\n",
+		freq, startup, prescal, tracktim);
 	st->current_sample_rate = freq;
 }
 
@@ -1522,6 +1730,7 @@ static irqreturn_t at91_adc_interrupt(int irq, void *private)
 	return IRQ_HANDLED;
 }
 
+/* This needs to be called with direct mode claimed and st->lock locked. */
 static int at91_adc_read_info_raw(struct iio_dev *indio_dev,
 				  struct iio_chan_spec const *chan, int *val)
 {
@@ -1529,50 +1738,46 @@ static int at91_adc_read_info_raw(struct iio_dev *indio_dev,
 	u16 tmp_val;
 	int ret;
 
+	ret = pm_runtime_resume_and_get(st->dev);
+	if (ret < 0)
+		return ret;
+
 	/*
 	 * Keep in mind that we cannot use software trigger or touchscreen
 	 * if external trigger is enabled
 	 */
 	if (chan->type == IIO_POSITIONRELATIVE) {
-		ret = iio_device_claim_direct_mode(indio_dev);
-		if (ret)
-			return ret;
-		mutex_lock(&st->lock);
-
 		ret = at91_adc_read_position(st, chan->channel,
 					     &tmp_val);
 		*val = tmp_val;
-		mutex_unlock(&st->lock);
-		iio_device_release_direct_mode(indio_dev);
+		if (ret > 0)
+			ret = at91_adc_adjust_val_osr(st, val);
 
-		return at91_adc_adjust_val_osr(st, val);
+		goto pm_runtime_put;
 	}
 	if (chan->type == IIO_PRESSURE) {
-		ret = iio_device_claim_direct_mode(indio_dev);
-		if (ret)
-			return ret;
-		mutex_lock(&st->lock);
-
 		ret = at91_adc_read_pressure(st, chan->channel,
 					     &tmp_val);
 		*val = tmp_val;
-		mutex_unlock(&st->lock);
-		iio_device_release_direct_mode(indio_dev);
+		if (ret > 0)
+			ret = at91_adc_adjust_val_osr(st, val);
 
-		return at91_adc_adjust_val_osr(st, val);
+		goto pm_runtime_put;
 	}
 
-	/* in this case we have a voltage channel */
-
-	ret = iio_device_claim_direct_mode(indio_dev);
-	if (ret)
-		return ret;
-	mutex_lock(&st->lock);
+	/* in this case we have a voltage or temperature channel */
 
 	st->chan = chan;
 
 	at91_adc_cor(st, chan);
 	at91_adc_writel(st, CHER, BIT(chan->channel));
+	/*
+	 * TEMPMR.TEMPON needs to update after CHER otherwise if none
+	 * of the channels are enabled and TEMPMR.TEMPON = 1 will
+	 * trigger DRDY interruption while preparing for temperature read.
+	 */
+	if (chan->type == IIO_TEMP)
+		at91_adc_writel(st, TEMPMR, AT91_SAMA5D2_TEMPMR_TEMPON);
 	at91_adc_eoc_ena(st, chan->channel);
 	at91_adc_writel(st, CR, AT91_SAMA5D2_CR_START);
 
@@ -1592,14 +1797,125 @@ static int at91_adc_read_info_raw(struct iio_dev *indio_dev,
 	}
 
 	at91_adc_eoc_dis(st, st->chan->channel);
+	if (chan->type == IIO_TEMP)
+		at91_adc_writel(st, TEMPMR, 0U);
 	at91_adc_writel(st, CHDR, BIT(chan->channel));
 
 	/* Needed to ACK the DRDY interruption */
 	at91_adc_readl(st, LCDR);
 
+pm_runtime_put:
+	pm_runtime_mark_last_busy(st->dev);
+	pm_runtime_put_autosuspend(st->dev);
+	return ret;
+}
+
+static int at91_adc_read_info_locked(struct iio_dev *indio_dev,
+				     struct iio_chan_spec const *chan, int *val)
+{
+	struct at91_adc_state *st = iio_priv(indio_dev);
+	int ret;
+
+	ret = iio_device_claim_direct_mode(indio_dev);
+	if (ret)
+		return ret;
+
+	mutex_lock(&st->lock);
+	ret = at91_adc_read_info_raw(indio_dev, chan, val);
 	mutex_unlock(&st->lock);
 
 	iio_device_release_direct_mode(indio_dev);
+
+	return ret;
+}
+
+static void at91_adc_temp_sensor_configure(struct at91_adc_state *st,
+					   bool start)
+{
+	u32 sample_rate, oversampling_ratio;
+	u32 startup_time, tracktim, trackx;
+
+	if (start) {
+		/*
+		 * Configure the sensor for best accuracy: 10MHz frequency,
+		 * oversampling rate of 256, tracktim=0xf and trackx=1.
+		 */
+		sample_rate = 10 * MEGA;
+		oversampling_ratio = 256;
+		startup_time = AT91_SAMA5D2_MR_STARTUP_TS_MIN;
+		tracktim = AT91_SAMA5D2_MR_TRACKTIM_TS;
+		trackx = AT91_SAMA5D2_TRACKX_TS;
+
+		st->temp_st.saved_sample_rate = st->current_sample_rate;
+		st->temp_st.saved_oversampling = st->oversampling_ratio;
+	} else {
+		/* Go back to previous settings. */
+		sample_rate = st->temp_st.saved_sample_rate;
+		oversampling_ratio = st->temp_st.saved_oversampling;
+		startup_time = st->soc_info.startup_time;
+		tracktim = 0;
+		trackx = 0;
+	}
+
+	at91_adc_setup_samp_freq(st->indio_dev, sample_rate, startup_time,
+				 tracktim);
+	at91_adc_config_emr(st, oversampling_ratio, trackx);
+}
+
+static int at91_adc_read_temp(struct iio_dev *indio_dev,
+			      struct iio_chan_spec const *chan, int *val)
+{
+	struct at91_adc_state *st = iio_priv(indio_dev);
+	struct at91_adc_temp_sensor_clb *clb = &st->soc_info.temp_sensor_clb;
+	u64 div1, div2;
+	u32 tmp;
+	int ret, vbg, vtemp;
+
+	ret = iio_device_claim_direct_mode(indio_dev);
+	if (ret)
+		return ret;
+	mutex_lock(&st->lock);
+
+	ret = pm_runtime_resume_and_get(st->dev);
+	if (ret < 0)
+		goto unlock;
+
+	at91_adc_temp_sensor_configure(st, true);
+
+	/* Read VBG. */
+	tmp = at91_adc_readl(st, ACR);
+	tmp |= AT91_SAMA5D2_ACR_SRCLCH;
+	at91_adc_writel(st, ACR, tmp);
+	ret = at91_adc_read_info_raw(indio_dev, chan, &vbg);
+	if (ret < 0)
+		goto restore_config;
+
+	/* Read VTEMP. */
+	tmp &= ~AT91_SAMA5D2_ACR_SRCLCH;
+	at91_adc_writel(st, ACR, tmp);
+	ret = at91_adc_read_info_raw(indio_dev, chan, &vtemp);
+
+restore_config:
+	/* Revert previous settings. */
+	at91_adc_temp_sensor_configure(st, false);
+	pm_runtime_mark_last_busy(st->dev);
+	pm_runtime_put_autosuspend(st->dev);
+unlock:
+	mutex_unlock(&st->lock);
+	iio_device_release_direct_mode(indio_dev);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * Temp[milli] = p1[milli] + (vtemp * clb->p6 - clb->p4 * vbg)/
+	 *			     (vbg * AT91_ADC_TS_VTEMP_DT)
+	 */
+	div1 = DIV_ROUND_CLOSEST_ULL(((u64)vtemp * clb->p6), vbg);
+	div1 = DIV_ROUND_CLOSEST_ULL((div1 * 1000), AT91_ADC_TS_VTEMP_DT);
+	div2 = DIV_ROUND_CLOSEST_ULL((u64)clb->p4, AT91_ADC_TS_VTEMP_DT);
+	div2 *= 1000;
+	*val = clb->p1 + (int)div1 - (int)div2;
+
 	return ret;
 }
 
@@ -1611,7 +1927,8 @@ static int at91_adc_read_raw(struct iio_dev *indio_dev,
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
-		return at91_adc_read_info_raw(indio_dev, chan, val);
+		return at91_adc_read_info_locked(indio_dev, chan, val);
+
 	case IIO_CHAN_INFO_SCALE:
 		*val = st->vref_uv / 1000;
 		if (chan->differential)
@@ -1619,6 +1936,11 @@ static int at91_adc_read_raw(struct iio_dev *indio_dev,
 		*val2 = chan->scan_type.realbits;
 		return IIO_VAL_FRACTIONAL_LOG2;
 
+	case IIO_CHAN_INFO_PROCESSED:
+		if (chan->type != IIO_TEMP)
+			return -EINVAL;
+		return at91_adc_read_temp(indio_dev, chan, val);
+
 	case IIO_CHAN_INFO_SAMP_FREQ:
 		*val = at91_adc_get_sample_freq(st);
 		return IIO_VAL_INT;
@@ -1637,31 +1959,60 @@ static int at91_adc_write_raw(struct iio_dev *indio_dev,
 			      int val, int val2, long mask)
 {
 	struct at91_adc_state *st = iio_priv(indio_dev);
+	int ret;
 
 	switch (mask) {
 	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
-		if ((val != AT91_OSR_1SAMPLES) && (val != AT91_OSR_4SAMPLES) &&
-		    (val != AT91_OSR_16SAMPLES))
-			return -EINVAL;
 		/* if no change, optimize out */
 		if (val == st->oversampling_ratio)
 			return 0;
-		st->oversampling_ratio = val;
+
+		ret = iio_device_claim_direct_mode(indio_dev);
+		if (ret)
+			return ret;
+		mutex_lock(&st->lock);
 		/* update ratio */
-		at91_adc_config_emr(st);
-		return 0;
+		ret = at91_adc_config_emr(st, val, 0);
+		mutex_unlock(&st->lock);
+		iio_device_release_direct_mode(indio_dev);
+		return ret;
 	case IIO_CHAN_INFO_SAMP_FREQ:
 		if (val < st->soc_info.min_sample_rate ||
 		    val > st->soc_info.max_sample_rate)
 			return -EINVAL;
 
-		at91_adc_setup_samp_freq(indio_dev, val);
+		ret = iio_device_claim_direct_mode(indio_dev);
+		if (ret)
+			return ret;
+		mutex_lock(&st->lock);
+		at91_adc_setup_samp_freq(indio_dev, val,
+					 st->soc_info.startup_time, 0);
+		mutex_unlock(&st->lock);
+		iio_device_release_direct_mode(indio_dev);
 		return 0;
 	default:
 		return -EINVAL;
 	}
 }
 
+static int at91_adc_read_avail(struct iio_dev *indio_dev,
+			       struct iio_chan_spec const *chan,
+			       const int **vals, int *type, int *length,
+			       long mask)
+{
+	struct at91_adc_state *st = iio_priv(indio_dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+		*vals = (int *)st->soc_info.platform->oversampling_avail;
+		*type = IIO_VAL_INT;
+		*length = st->soc_info.platform->oversampling_avail_no;
+		return IIO_AVAIL_LIST;
+	default:
+		return -EINVAL;
+	}
+}
+
 static void at91_adc_dma_init(struct at91_adc_state *st)
 {
 	struct device *dev = &st->indio_dev->dev;
@@ -1817,10 +2168,11 @@ static void at91_adc_hw_init(struct iio_dev *indio_dev)
 	at91_adc_writel(st, MR,
 			AT91_SAMA5D2_MR_TRANSFER(2) | AT91_SAMA5D2_MR_ANACH);
 
-	at91_adc_setup_samp_freq(indio_dev, st->soc_info.min_sample_rate);
+	at91_adc_setup_samp_freq(indio_dev, st->soc_info.min_sample_rate,
+				 st->soc_info.startup_time, 0);
 
 	/* configure extended mode register */
-	at91_adc_config_emr(st);
+	at91_adc_config_emr(st, st->oversampling_ratio, 0);
 }
 
 static ssize_t at91_adc_get_fifo_state(struct device *dev,
@@ -1849,20 +2201,6 @@ static IIO_DEVICE_ATTR(hwfifo_watermark, 0444,
 static IIO_CONST_ATTR(hwfifo_watermark_min, "2");
 static IIO_CONST_ATTR(hwfifo_watermark_max, AT91_HWFIFO_MAX_SIZE_STR);
 
-static IIO_CONST_ATTR(oversampling_ratio_available,
-		      __stringify(AT91_OSR_1SAMPLES) " "
-		      __stringify(AT91_OSR_4SAMPLES) " "
-		      __stringify(AT91_OSR_16SAMPLES));
-
-static struct attribute *at91_adc_attributes[] = {
-	&iio_const_attr_oversampling_ratio_available.dev_attr.attr,
-	NULL,
-};
-
-static const struct attribute_group at91_adc_attribute_group = {
-	.attrs = at91_adc_attributes,
-};
-
 static const struct attribute *at91_adc_fifo_attributes[] = {
 	&iio_const_attr_hwfifo_watermark_min.dev_attr.attr,
 	&iio_const_attr_hwfifo_watermark_max.dev_attr.attr,
@@ -1872,11 +2210,11 @@ static const struct attribute *at91_adc_fifo_attributes[] = {
 };
 
 static const struct iio_info at91_adc_info = {
-	.attrs = &at91_adc_attribute_group,
+	.read_avail = &at91_adc_read_avail,
 	.read_raw = &at91_adc_read_raw,
 	.write_raw = &at91_adc_write_raw,
 	.update_scan_mode = &at91_adc_update_scan_mode,
-	.of_xlate = &at91_adc_of_xlate,
+	.fwnode_xlate = &at91_adc_fwnode_xlate,
 	.hwfifo_set_watermark = &at91_adc_set_watermark,
 };
 
@@ -1918,12 +2256,62 @@ static int at91_adc_buffer_and_trigger_init(struct device *dev,
 	return 0;
 }
 
+static int at91_adc_temp_sensor_init(struct at91_adc_state *st,
+				     struct device *dev)
+{
+	struct at91_adc_temp_sensor_clb *clb = &st->soc_info.temp_sensor_clb;
+	struct nvmem_cell *temp_calib;
+	u32 *buf;
+	size_t len;
+	int ret = 0;
+
+	if (!st->soc_info.platform->temp_sensor)
+		return 0;
+
+	/* Get the calibration data from NVMEM. */
+	temp_calib = devm_nvmem_cell_get(dev, "temperature_calib");
+	if (IS_ERR(temp_calib)) {
+		ret = PTR_ERR(temp_calib);
+		if (ret != -ENOENT)
+			dev_err(dev, "Failed to get temperature_calib cell!\n");
+		return ret;
+	}
+
+	buf = nvmem_cell_read(temp_calib, &len);
+	if (IS_ERR(buf)) {
+		dev_err(dev, "Failed to read calibration data!\n");
+		return PTR_ERR(buf);
+	}
+	if (len < AT91_ADC_TS_CLB_IDX_MAX * 4) {
+		dev_err(dev, "Invalid calibration data!\n");
+		ret = -EINVAL;
+		goto free_buf;
+	}
+
+	/* Store calibration data for later use. */
+	clb->p1 = buf[AT91_ADC_TS_CLB_IDX_P1];
+	clb->p4 = buf[AT91_ADC_TS_CLB_IDX_P4];
+	clb->p6 = buf[AT91_ADC_TS_CLB_IDX_P6];
+
+	/*
+	 * We prepare here the conversion to milli and also add constant
+	 * factor (5 degrees Celsius) to p1 here to avoid doing it on
+	 * hotpath.
+	 */
+	clb->p1 = clb->p1 * 1000 + 5000;
+
+free_buf:
+	kfree(buf);
+	return ret;
+}
+
 static int at91_adc_probe(struct platform_device *pdev)
 {
+	struct device *dev = &pdev->dev;
 	struct iio_dev *indio_dev;
 	struct at91_adc_state *st;
 	struct resource	*res;
-	int ret, i;
+	int ret, i, num_channels;
 	u32 edge_type = IRQ_TYPE_NONE;
 
 	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*st));
@@ -1933,13 +2321,20 @@ static int at91_adc_probe(struct platform_device *pdev)
 	st = iio_priv(indio_dev);
 	st->indio_dev = indio_dev;
 
-	st->soc_info.platform = of_device_get_match_data(&pdev->dev);
+	st->soc_info.platform = device_get_match_data(dev);
+
+	ret = at91_adc_temp_sensor_init(st, &pdev->dev);
+	/* Don't register temperature channel if initialization failed. */
+	if (ret)
+		num_channels = st->soc_info.platform->max_channels - 1;
+	else
+		num_channels = st->soc_info.platform->max_channels;
 
 	indio_dev->name = dev_name(&pdev->dev);
 	indio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE;
 	indio_dev->info = &at91_adc_info;
 	indio_dev->channels = *st->soc_info.platform->adc_channels;
-	indio_dev->num_channels = st->soc_info.platform->max_channels;
+	indio_dev->num_channels = num_channels;
 
 	bitmap_set(&st->touch_st.channels_bitmask,
 		   st->soc_info.platform->touch_chan_x, 1);
@@ -1948,36 +2343,34 @@ static int at91_adc_probe(struct platform_device *pdev)
 	bitmap_set(&st->touch_st.channels_bitmask,
 		   st->soc_info.platform->touch_chan_p, 1);
 
-	st->oversampling_ratio = AT91_OSR_1SAMPLES;
+	st->oversampling_ratio = 1;
 
-	ret = of_property_read_u32(pdev->dev.of_node,
-				   "atmel,min-sample-rate-hz",
-				   &st->soc_info.min_sample_rate);
+	ret = device_property_read_u32(dev, "atmel,min-sample-rate-hz",
+				       &st->soc_info.min_sample_rate);
 	if (ret) {
 		dev_err(&pdev->dev,
 			"invalid or missing value for atmel,min-sample-rate-hz\n");
 		return ret;
 	}
 
-	ret = of_property_read_u32(pdev->dev.of_node,
-				   "atmel,max-sample-rate-hz",
-				   &st->soc_info.max_sample_rate);
+	ret = device_property_read_u32(dev, "atmel,max-sample-rate-hz",
+				       &st->soc_info.max_sample_rate);
 	if (ret) {
 		dev_err(&pdev->dev,
 			"invalid or missing value for atmel,max-sample-rate-hz\n");
 		return ret;
 	}
 
-	ret = of_property_read_u32(pdev->dev.of_node, "atmel,startup-time-ms",
-				   &st->soc_info.startup_time);
+	ret = device_property_read_u32(dev, "atmel,startup-time-ms",
+				       &st->soc_info.startup_time);
 	if (ret) {
 		dev_err(&pdev->dev,
 			"invalid or missing value for atmel,startup-time-ms\n");
 		return ret;
 	}
 
-	ret = of_property_read_u32(pdev->dev.of_node,
-				   "atmel,trigger-edge-type", &edge_type);
+	ret = device_property_read_u32(dev, "atmel,trigger-edge-type",
+				       &edge_type);
 	if (ret) {
 		dev_dbg(&pdev->dev,
 			"atmel,trigger-edge-type not specified, only software trigger available\n");
@@ -2051,13 +2444,19 @@ static int at91_adc_probe(struct platform_device *pdev)
 	if (ret)
 		goto vref_disable;
 
-	at91_adc_hw_init(indio_dev);
-
 	platform_set_drvdata(pdev, indio_dev);
+	st->dev = &pdev->dev;
+	pm_runtime_set_autosuspend_delay(st->dev, 500);
+	pm_runtime_use_autosuspend(st->dev);
+	pm_runtime_set_active(st->dev);
+	pm_runtime_enable(st->dev);
+	pm_runtime_get_noresume(st->dev);
+
+	at91_adc_hw_init(indio_dev);
 
 	ret = at91_adc_buffer_and_trigger_init(&pdev->dev, indio_dev);
 	if (ret < 0)
-		goto per_clk_disable_unprepare;
+		goto err_pm_disable;
 
 	if (dma_coerce_mask_and_coherent(&indio_dev->dev, DMA_BIT_MASK(32)))
 		dev_info(&pdev->dev, "cannot set DMA mask to 32-bit\n");
@@ -2073,11 +2472,18 @@ static int at91_adc_probe(struct platform_device *pdev)
 	dev_info(&pdev->dev, "version: %x\n",
 		 readl_relaxed(st->base + st->soc_info.platform->layout->VERSION));
 
+	pm_runtime_mark_last_busy(st->dev);
+	pm_runtime_put_autosuspend(st->dev);
+
 	return 0;
 
 dma_disable:
 	at91_adc_dma_disable(st);
-per_clk_disable_unprepare:
+err_pm_disable:
+	pm_runtime_put_noidle(st->dev);
+	pm_runtime_disable(st->dev);
+	pm_runtime_set_suspended(st->dev);
+	pm_runtime_dont_use_autosuspend(st->dev);
 	clk_disable_unprepare(st->per_clk);
 vref_disable:
 	regulator_disable(st->vref);
@@ -2095,6 +2501,8 @@ static int at91_adc_remove(struct platform_device *pdev)
 
 	at91_adc_dma_disable(st);
 
+	pm_runtime_disable(st->dev);
+	pm_runtime_set_suspended(st->dev);
 	clk_disable_unprepare(st->per_clk);
 
 	regulator_disable(st->vref);
@@ -2107,6 +2515,14 @@ static int at91_adc_suspend(struct device *dev)
 {
 	struct iio_dev *indio_dev = dev_get_drvdata(dev);
 	struct at91_adc_state *st = iio_priv(indio_dev);
+	int ret;
+
+	ret = pm_runtime_resume_and_get(st->dev);
+	if (ret < 0)
+		return ret;
+
+	if (iio_buffer_enabled(indio_dev))
+		at91_adc_buffer_postdisable(indio_dev);
 
 	/*
 	 * Do a sofware reset of the ADC before we go to suspend.
@@ -2116,6 +2532,8 @@ static int at91_adc_suspend(struct device *dev)
 	 */
 	at91_adc_writel(st, CR, AT91_SAMA5D2_CR_SWRST);
 
+	pm_runtime_mark_last_busy(st->dev);
+	pm_runtime_put_noidle(st->dev);
 	clk_disable_unprepare(st->per_clk);
 	regulator_disable(st->vref);
 	regulator_disable(st->reg);
@@ -2145,21 +2563,28 @@ static int at91_adc_resume(struct device *dev)
 	if (ret)
 		goto vref_disable_resume;
 
+	pm_runtime_get_noresume(st->dev);
+
 	at91_adc_hw_init(indio_dev);
 
 	/* reconfiguring trigger hardware state */
-	if (!iio_buffer_enabled(indio_dev))
-		return 0;
+	if (iio_buffer_enabled(indio_dev)) {
+		ret = at91_adc_buffer_prepare(indio_dev);
+		if (ret)
+			goto pm_runtime_put;
 
-	/* check if we are enabling triggered buffer or the touchscreen */
-	if (at91_adc_current_chan_is_touch(indio_dev))
-		return at91_adc_configure_touch(st, true);
-	else
-		return at91_adc_configure_trigger(st->trig, true);
+		at91_adc_configure_trigger_registers(st, true);
+	}
+
+	pm_runtime_mark_last_busy(st->dev);
+	pm_runtime_put_autosuspend(st->dev);
 
-	/* not needed but more explicit */
 	return 0;
 
+pm_runtime_put:
+	pm_runtime_mark_last_busy(st->dev);
+	pm_runtime_put_noidle(st->dev);
+	clk_disable_unprepare(st->per_clk);
 vref_disable_resume:
 	regulator_disable(st->vref);
 reg_disable_resume:
@@ -2169,8 +2594,29 @@ resume_failed:
 	return ret;
 }
 
-static DEFINE_SIMPLE_DEV_PM_OPS(at91_adc_pm_ops, at91_adc_suspend,
-				at91_adc_resume);
+static int at91_adc_runtime_suspend(struct device *dev)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct at91_adc_state *st = iio_priv(indio_dev);
+
+	clk_disable(st->per_clk);
+
+	return 0;
+}
+
+static int at91_adc_runtime_resume(struct device *dev)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct at91_adc_state *st = iio_priv(indio_dev);
+
+	return clk_enable(st->per_clk);
+}
+
+static const struct dev_pm_ops at91_adc_pm_ops = {
+	SYSTEM_SLEEP_PM_OPS(at91_adc_suspend, at91_adc_resume)
+	RUNTIME_PM_OPS(at91_adc_runtime_suspend, at91_adc_runtime_resume,
+		       NULL)
+};
 
 static const struct of_device_id at91_adc_dt_match[] = {
 	{
@@ -2191,7 +2637,7 @@ static struct platform_driver at91_adc_driver = {
 	.driver = {
 		.name = "at91-sama5d2_adc",
 		.of_match_table = at91_adc_dt_match,
-		.pm = pm_sleep_ptr(&at91_adc_pm_ops),
+		.pm = pm_ptr(&at91_adc_pm_ops),
 	},
 };
 module_platform_driver(at91_adc_driver)